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Pear species belong to the genus Pyrus in the subfamily Maloideae of the family Rosaceae. This genus is considered to have originated in the mountainous regions of western and southwestern China during the Tertiary period and spread into the east and west.
Itai, Akihiro +5 more
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Pear, Pear Psylla Control, 1981
Insecticide and Acaricide Tests, 1982Abstract This test was conducted within a commercial orchard comprised of 9-year-old trees. Single-tree plots were arranged in a complete randomized block design with 5 replications. Treated trees were separated within rows by at least one unsprayed tree and adult psylla were available to repopulate test plots. Treatments were applied on
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